//连接数据库
const mongoose = require('mongoose');
module.exports = new Promise((resolve,reject)=>{
    mongoose.connect('mongodb://localhost:27017/student_2203_jk',{useNewUrlParser:true,useUnifiedTopology:true,useCreateIndex:true});
    mongoose.connection.once('open',err=>{
        if(!err){
            console.log('数据库连接成功！');
            resolve();
        }else{
            console.log(err);
            reject(err);
        }
    })
})